Are there any socket options similar to "IP_RECVTTL" or an alternate way to retrieve TTL values from received tcp packets in RHEL?

Issue

• For datagram sockets (UDP) you have these socket options IP_RECVTTL and IP_TTL which helps reading the TTL values of incoming and outgoing packets.
• Is there any similar options available for TCP sockets as well?
• Why sockets options likeIP_RECVTTL fails to retrieve TTL values from incoming socket?
• Are there any ways to detect tethering from incoming TCP packet using TTL ?